Image Theses and Dissertations Mathematical simulation of the solidification of steel in the electroslag remelting process A mathematical model of the solidification process in an ingot remelted by the continuous electroslag process was developed to predict the influence of process parameters on the temperature distribution of the ingot and more precisely on the shape of the molten metal pool. View Item
Image Theses and Dissertations The reliability of simple progressive dies The stamping process, of which the punching process is a major division, is one of the most important metal parts production methods in industry. Punching dies are the heart of the punching process. Die performance, as measured by the number of strokes between sharpenings and/or repairs, determines the important per part costs of die depletion and maintenance. Existing quantitative studies are principally on tool wear and punchability. View Item
Image Theses and Dissertations The effect of organic addition agents on the deposition of copper from fluoborate electrolytes The effect of organic addition agents on the levelling ability of copper fluoborate electrolytes was investigated for copper desposition. View Item
Image Theses and Dissertations On the hypothesis that a direct correlation exists between methods changes and related productivity changes in non machine-controlled work situations This hypothesis: a direct correlation exists between methods changes and related productivity changes in non machine-controlled work situations, appeared to be at the root of many problems in applied work measurement. Therefore, the author decided to conduct an objective, quantitative analysis of its validity. View Item
Image Theses and Dissertations The utility of information a method of evaluation The fundamental relationships among the design parameters of an information system and the utility of the information that a system produces are analyzed in an effort to develop a methodology for measuring the utility of information. The utility of the information is defined as a measure of the effectiveness with which the information can be employed to attain the objectives of the using organization. View Item
Image Theses and Dissertations An investigation into the output distributions of gert networks by the use of simulation The purpose of this research was to further the investigation into GERT output distributions. From the family of GERT networks containing only Exclusive-Or nodes, a generally applicable network form was chosen for simulation. A generalized computer program was written to simulate any specific network of this form. View Item
Image Theses and Dissertations Application of a simulator for short term forecasting in a high volume multi-product production line The solutions to the problems of production forecasting, scheduling, and in-process inventory control for high volume multi-product manufacturing lines are not readily available in current industrial literature. This study proposes simulation as a general approach to solving these problems and proceeds to develop a simulator which is applied to just such a high volume line. View Item
Image Theses and Dissertations Utility sub-systems in the building industry The building industry is perhaps the most fragmented large industrial complex in the country today. Consumers are expressing needs for faster delivery for more functional and sophisticated space at more reasonalble prices. At the same time, the industry in itself is faced with growing internal problems which are making it increasingly more difficult to perform even as well as in the past. This study investigates the area of utility sub-systems in the building industry. View Item
Image Theses and Dissertations The effect of an organic addition agent on cupric fluoborate electrodeposits The effects of a proprietary organic addition agent on electrodeposits from a cupric fluoborate electroplating bath have been studied. A number of physical and mechanical properties of the deposit were found to correlate with addition agent concentration. View Item
Image Theses and Dissertations The production of ion-implanted plug diffusion contacts in gallium phosphide One particularly attractive application for Light Emitting Diodes is in planar arrays. A process has been developed to diffuse ion-implanted Zn in GaP over distances for the production of plug diffusion contacts in thin epitaxial layers. View Item
Image Theses and Dissertations An investigation of the relationship between manufacturing policies and plant layout in a job shop Utilizing CRAFT an optimum plant layout with regard to all products manufactured can be realized. In addition, two manufacturing policies; related to production and inventory control, will be investigated with respect to the effect of said policies on plant layout. View Item
Image Theses and Dissertations Surface elongation and interfacial sliding during gold-gold thermocompression bonding / View Item
Image Theses and Dissertations On the computational efficiencies of the primal-dual algorithm and the uv-method for solving transportation problems Computational efficiencies of the primal-dual algorithm and the uv-method in solving transportation problems are compared in this thesis. A computer program was written in Fortran IV and run on the CDC 6400 system; it generated random problems with integer constants ranging in the size from 5X10 to 30 X 50, and solved them by both methods. View Item
Image Theses and Dissertations A non-parametric incremental feedback control system for stochastic processes This is a result of an initial investigation to simplify feedback controllers for stochastic processes. The investigation concerns itself with incrimental control as opposed to proportional control. View Item
Image Theses and Dissertations Quantification of intangible factors in product design decisions This paper concerns itself with quantification of the intangible factors in Product Design Decisions where there is one very big supplier with one very big customer and a unique product. The product design is represented as a state diagram, or curve, with Time as one axis and Product or Material State as the other. Industry affects the product design curve with various levels of decisions. This paper describes four of these levels and investigates a case in which three levels are involved. View Item
Image Theses and Dissertations A method of estimating the value of a computer based on-line operations control system in a production shop A simulation program is presented that develops a risk profile of the intended investment. The risk profile is essentially a return on investment probability analysis developed from the estimated distributions of costs, service life and savings of the intended investment in a computer based, on-line system. View Item
Image Theses and Dissertations A study of the growth of the inhibiting aluminum-roch alloy layer formed on steel during galavanizing in aluminum-bearing zinc The purpose of this work was to determine the rate of growth of the inhibiting aluminum-rich alloy later, to identify the compounds that comprise it and to examine the nature of its growth. Specifically, the weight of the aluminum-rich alloy layer was measured as a function of time and temperature on coatings made in Special High Grade zinc baths containing 0.20% and 0.30% aluminum. In addition, low and intermediate iron levels were studied in the 0.20% aluminum bath and only the low iron level was studied in the 0.30% aluminum bath. View Item
Image Theses and Dissertations The formation of ohmic contacts to semiconductors using laser beam energy The laser beam is proposed as a heat source to form an alloy or a diffusion layer of degenerate material by which ohmic contact can be made. View Item
Image Theses and Dissertations An investigation of the feasibility of applying linear progamming to assembly line balancing An investigation of the feasibility of applying linear programming to assembly line balancing problems is presented. Salveson and Bowman developed the mathematical models. View Item
Image Theses and Dissertations An investigation of the effects of an electric field on the diffusion of chromium in aluminum oxide A radioactive isotope technique was used to investigate the effect of an electric field on the diffusion of chromium in single crystal aluminum oxide of the corundum structure. The diffusion experiments were conducted in the temperature range 1220-1240 C with electric fields of different magnitudes. View Item
Image Theses and Dissertations Effects of zinc oxide on the magnesium-manganese ferrite memory sheet Zinc oxide was used as an additive in the square-loop memory sheet to determine if the sintering process could be improved. A metallurgical examination of the microstructure did not reveal a significant dependence of porosity and grain size on zinc content. In addition, no effect was observed in the linear shrinkage measurements. View Item
Image Theses and Dissertations Studies of diffusion and related phenomena for the Q' region of the aluminum-gold binary system The object of this experimental investigation was to determine the diffusion coefficient and its variation with concentration, for the single phase gold rich region of the aluminum gold binary system. View Item
Image Theses and Dissertations A statisical study of the electrothermic zinc-smelting process Multiple regression equations were calculated in an effort to relate various quantities characterizing the electrothermic zinc-smelting process. The invention of a parameter called unit production to characterize the process is thought to be the most valuable contribution. View Item